function checkemailform()
{
	var docform = document.forms[0];
	docform.submit.disabled = true;
	docform.submit.value = 'Please Wait...';
	
	if(docform.email.value == '')
	{
		alert('Please enter your email address.');
		enableemailform();
		return false;
	}
	
	return true;
}

function enableemailform()
{
	var docform = document.forms[0];
	docform.submit.disabled = false;
	docform.submit.value = 'Submit';
}